ArrayBlockingQueue 中的 size() 方法
欲了解队列中元素的数目,使用 ArrayBlockingQueue 类的 size() 方法。
语法如下
int size()
要使用 ArrayBlockingQueue 类,需要导入以下包
import java.util.concurrent.ArrayBlockingQueue;
以下是一个使用 Java ArrayBlockingQueue 类的 size() 方法的示例
示例
import java.util.concurrent.ArrayBlockingQueue;
public class Demo {
public static void main(String[] args) throws InterruptedException {
ArrayBlockingQueue<Integer> q = new ArrayBlockingQueue<Integer>(10);
q.add(200);
q.add(310);
q.add(400);
q.add(450);
q.add(500);
q.add(550);
q.add(700);
System.out.println("ArrayBlockingQueue = " + q);
System.out.println("The head of the queue = "+q.take());
System.out.println("Number of elements in the queue = "+q.size());
// adding more elements
q.add(50);
q.add(70);
q.add(90);
System.out.println("ArrayBlockingQueue = " + q);
System.out.println("The head of the queue = "+q.take());
System.out.println("Number of elements in the queue = "+q.size());
}
}输出
ArrayBlockingQueue = [200, 310, 400, 450, 500, 550, 700] The head of the queue = 200 Number of elements in the queue = 6 ArrayBlockingQueue = [310, 400, 450, 500, 550, 700, 50, 70, 90] The head of the queue = 310 Number of elements in the queue = 8
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